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https://issues.apache.org/jira/browse/HDFS-5440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13820527#comment-13820527
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Jing Zhao commented on HDFS-5440:
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After discussing with [~owen.omalley], looks like we still need to replicate
the token and set one of them with HDFS_DELEGATION_TOKEN kind, in order to keep
the back compatibility.
Currently in trunk, branch-2 and branch-1.x, in the StreamFile servlet (in DN),
after receiving a HftpFileSystem request, the DN will rewrite the token kind to
HDFS_DELEGATION_TOKEN. That's why the current patch works fine with these
branches. However, in older branch like 0.20.203, the token kind will not be
overwritten, thus this token will not be selected by the DFSClient in later RPC
call to NN. Thus the current patch will not work when communicating with such
old servers.
> Extract the logic of handling delegation tokens in HftpFileSystem to the
> TokenAspect class
> ------------------------------------------------------------------------------------------
>
> Key: HDFS-5440
> URL: https://issues.apache.org/jira/browse/HDFS-5440
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Haohui Mai
> Assignee: Haohui Mai
> Attachments: HDFS-5440.000.patch, HDFS-5440.001.patch,
> HDFS-5440.002.patch
>
>
> The logic of handling delegation token in HftpFileSystem and
> WebHdfsFileSystem are mostly identical. To simplify the code, this jira
> proposes to extract the common code into a new class named TokenAspect.
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